GAUGE IN MEASUREMENT POSITION BUT DISPLAY
INDICATES SAFE POSITION
C. MAINTENANCE
✓ Switch is defective.
✓ Press 〈START/ENTER〉 again.
✓ Call your nearest Troxler Service Center (page C-17) for
replacement part (page C-13).
NO DENSITY READINGS
✓ The most likely reason for no density readings is an electronic
problem, such as a failure of the detector preamplifier.
However, as a precaution, ensure that the tip of the source rod is
intact and undamaged (that is, ensure that the source is not
missing). Use a radiation survey meter to check the radiation
levels at the gauge base surface (without extending the source
rod). A maximum reading of 10-20 mrem/hr is normal, and
indicates the source is present. However, if the maximum
reading is less than 1 mrem/hr or if a survey meter is not
available, perform a visual inspection of the source rod tip as
follows to confirm its integrity:
1. Extend the source rod just far enough to see the source rod
tip. The tip should appear flat to slightly rounded and
smooth.
2. Stay at least 3 ft (1 m) away from the tip of the unshielded
source rod and complete the inspection as quickly as
possible to minimize exposure (the dose rate at 3 ft from the
unshielded source is about 2.7 mrem/hr).
If the visual inspection indicates that the source rod tip is
broken off (source is missing):
1. Immediately contact your Radiation Safety Officer (RSO).
2. Initiate a search for the source starting at the location where
the gauge was last used.
3. Report lost or missing radioactive sources to the state or
federal radiation control agency in accordance with
applicable regulatory requirements.
4. Contact the Troxler Radiation Safety Department for further
advice.
Model 4640-B Appendix C–5
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